作者kentarosu (肯泰罗)
看板trans_math
标题[考古] 98政大国贸微积分
时间Fri Jun 18 23:00:07 2010
98年政大国贸微积分第10题
原考题：
http://img638.imageshack.us/img638/9569/22679131.jpg
A ladder 26 ft long leans against a vertical wall. If the lower end is moved
away from the wall at the rate of 5(ft/sec), how fast is the height of the
top decreasing when the the lower end is 10 ft from the wall?
不知道该怎麽解
想请大家帮忙给一些头绪
若能帮忙详细解答更佳^^"
拜托了 感谢~
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◆ From: 114.33.56.62
1F：推 a039333780:毕氏定理+全微分 122.117.249.30 06/19 00:54
2F：推 a039333780:x^2+y^2=26^2 122.117.249.30 06/19 01:25
3F：→ a039333780:对t微分 然後题目给的带进去 122.117.249.30 06/19 01:26
4F：→ a039333780:dx/dt=5 且x=10 故y=24 (毕氏定理) 122.117.249.30 06/19 01:27
5F：→ a039333780:只剩下dy/dt待解而已= = 122.117.249.30 06/19 01:27
6F：→ a039333780:这题也算长考的题目@@@@ 122.117.249.30 06/19 01:28